US8380063B2 - Switched optical fibre network for airplane seats - Google Patents

Switched optical fibre network for airplane seats Download PDF

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Publication number
US8380063B2
US8380063B2 US12/521,832 US52183208A US8380063B2 US 8380063 B2 US8380063 B2 US 8380063B2 US 52183208 A US52183208 A US 52183208A US 8380063 B2 US8380063 B2 US 8380063B2
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network
switch
optical
switching box
optical fiber
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US20100098418A1 (en
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Loïc Bouet
Benoit Guichard
Jerome Marquet
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Zodiac Inflight Innovations SAS
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SiT SAS
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Assigned to ZODIAC CABIN reassignment ZODIAC CABIN ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SOCIETE INDUSTRIELLE ET COMMERCIALE DE MATERIEL AERONAUTIQUE - SICMA AERO SEAT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission

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  • the present invention pertains to a switched optical fiber network for airplane seats.
  • the object of the present invention is especially to secure such a network in case of failure of one of its switching elements.
  • screens are integrated in each seat as much for the broadcasting of entertainment programs (music, films, video games, etc.) as for the transmission of safety messages (buckling of belts, use of electronic devices, etc.). These screens are connected within a network to a central computer or server.
  • FIG. 1 shows a prior-art network 1 , in which screens 2 . 1 - 2 .N of seats 3 . 1 - 3 .N are connected to a server 4 .
  • These screens 2 . 1 - 2 .N are connected to the server 4 via network switches 4 . 1 - 4 . 3 or switches.
  • These switches 4 . 1 - 4 . 3 transmit the information received on one of their ports to the screen to which it is intended.
  • the cables 5 which ensure the links between the switches 4 . 1 - 4 . 3 and the server 3 , are copper cables in which signals circulate that are generally the standard of the Ethernet bus.
  • This type of network has the drawback of being heavy since copper is a high-density metal.
  • One solution consists of replacing it with aluminum, whose density is 3.3 times lighter.
  • aluminum is not used very widely—at least for cables of small sections, it poses difficulties in terms of connecting to connectors, as well as in terms of contact quality and risk of corrosion.
  • this type of network produces a relatively intense electromagnetic field, which makes it necessary to take a lot of precautions as much for preventing interference with electronic equipment in the vicinity as for being parasitized by the equipment of the airplane.
  • optical couplers 10 . 1 - 10 . 3 replace the previous switches.
  • These optical couplers 10 . 1 - 10 . 3 are light shunters which do not comprise any component capable of failing and do not require any electric power supply. The weight of the fiber by itself is negligible, and the light beam not only does not generate parasitics, but is not susceptible to interfering electromagnetic fields.
  • Such a network is called a PON network (for Passive Optical Network in English).
  • the transceivers 11 . 1 - 11 . 3 and 12 (transceiver in English) are positioned between the communicating elements (screens or server) and the couplers for converting the electric signals into light signals and vice versa.
  • each coupler 10 . 1 - 10 . 3 introduces an attenuation of the signal which limits the number of seats connected to a single fiber.
  • a passive optical network can hardly serve more than 12 seats, which makes it necessary either to multiply the number of optical fibers or to re-amplify the light signal every 12 couplers, in which case, we again find the risks of failures of the Ethernet bus affecting copper cables.
  • the present invention proposes to overcome these above-mentioned drawbacks of the optical network.
  • the simple couplers are replaced with active optical switches of the type MEMS (for Micro-Electro-Mechanical Systems in English), which comprise a mobile micro-mirror.
  • the switch can thus orient the light signal circulating in the optical fiber by two directions. One is stable in the absence of control (inactive position), the other is temporary and is only obtained when voltage is applied to the switch.
  • the switch In the temporary position, the switch delivers the light beam to the screen and re-amplifies it in the optical fiber, while in the inactive position, the switch delivers this light beam directly to the next seat.
  • the switch is an active device. However, it is called “positive safety” because in case of failure of the control electronics, or in case of a loss of power supply, the switch returns, of course, to an inactive position.
  • optical network according to the present invention is therefore suitable for new high-capacity airplanes.
  • the present invention pertains to a switched optical fiber network for airplane seats, this network comprising screens connected to each other via an optical fiber, a signal light circulating in this optical fiber to these screens,
  • the upstream switching box comprises an optical switch, this optical switch comprising a fixed mirror and two mobile mirrors rotating about an axis. These mirrors are positioned in such a way that they reflect the light signal to the downstream switching box when the switch is not live, the switch thus being in an inactive position. These mirrors are positioned in such a way that they reflect the light signal to the screen and to the downstream switch when the optical switch is live, the optical switch thus being in an active position.
  • each mobile mirror of the optical switch comprises a first and a second control electrode.
  • the first electrode is positioned on one end of the mobile mirror and the second electrode is positioned on the fixed part of the switch.
  • the optical switch is in the inactive position when the two electrodes are not live, while it is in the active position when the two electrodes are live.
  • the upstream switching box additionally comprises a transceiver positioned between the screen and the optical switch of the upstream box. This transceiver ensures the conversion of the light signal sent over the optical fibers into an electric signal sent to the screen and vice versa, as well as the amplification of the light signal sent to the downstream switching box.
  • an Ethernet type network switch is connected between the optical switch of a switching box and the screen to which it is connected, other screens being connected to this network switch.
  • a server is connected to the screens via the optical fiber, this server sending data, such as instructional data, to the screens of the network.
  • the optical fiber is bidirectional.
  • FIG. 1 shows a schematic representation of a network comprising copper cables according to the state of the art
  • FIG. 2 shows a schematic representation of an optical fiber network according to the state of the art
  • FIG. 3 shows a schematic representation of a switched optical fiber network according to the present invention
  • FIGS. 4 a , 4 b show schematic representations of the optical switches according to the present invention in their operating positions
  • FIG. 4 c shows a schematic representation of a micro-mirror and of the electrodes of the switch according to the present invention
  • FIG. 5 shows a schematic representation of a variant of the optical fiber network according to the present invention
  • FIGS. 6 a - 6 b show schematic representations of a switching device connecting the optical switch to its power supply in a closed and open state, respectively;
  • FIG. 7 shows a schematic representation of a network architecture comprising modules for monitoring the network ensuring control of the optical switches.
  • FIG. 3 shows a switched optical fiber network 1 for airplane seats 3 . 1 - 3 .N.
  • This network 1 comprises screens 2 . 1 - 2 .N connected to each other and to a server 4 via an optical fiber 9 .
  • These screens 2 . 1 - 2 .N each comprise a computer (not shown) provided with a network card which enables them to exchange data on an Ethernet type network.
  • These screens 2 . 1 - 2 .N are connected to the optical fiber 9 via switching boxes 13 . 1 - 13 .N connected in series to each other.
  • Each switching box 13 . 1 - 13 .N comprises an optical switch 14 . 1 - 14 .N and two transceivers 15 . 1 - 15 .N and 16 . 1 - 16 .N (transceivers in English) connected, on the one hand, to the optical switch 14 . 1 - 14 .N and, on the other hand, to the screen 2 . 1 - 2 .N.
  • the server 4 is also provided with a transceiver 12 connected, on the one hand, to this server 4 and, on the other hand, to the optical fiber.
  • the transceivers 12 and 15 . 1 - 15 .N convert the electric signals, under the Ethernet standard, for example, into light signal and vice versa. These transceivers are bidirectional so as either to receive the signals from the optical fiber 9 to send them to the screens 2 . 1 - 2 .N or the server 4 , or to receive data from these screens 2 . 1 - 2 .N or the server 4 to send same over the optical fiber 9 .
  • a switch When a switch is in an active position, such as the switches 14 . 1 , 14 . 3 and 14 .N shown, the information sent by the server 4 reaches the screen of a passenger via the transceivers 12 , and 15 . 1 - 15 .N. After re-amplification, the light signal starts off again on an optical fiber section to end at the next screen.
  • the switch is in an active position when it is supplied with power.
  • switch 14 . 2 if one of the switches is inactive, such as switch 14 . 2 shown, the switch is an inactive position, and the light signal passes directly to the next seat.
  • This inactive position is the default position of the switch that can be observed when the optical switch is supplied with power.
  • an electric signal 18 pertaining to this information is sent to the transceiver 12 .
  • This transceiver 12 converts the electric signal 18 into a light signal 19 which is sent to the optical switch 14 . 1 via an optical fiber section 9 . 1 .
  • This switch 14 . 1 which is in an active position, deviates the signal 19 to the transceiver 15 . 1 which converts it into an electric signal 20 .
  • This electric signal 20 is then sent to the screen 2 . 1 which displays the safety data associated with this signal.
  • the signal 20 is also sent to the transceiver 16 . 1 which converts it into a light signal 21 whose contents are identical to the signal 19 .
  • This signal 21 was amplified by the transceiver 16 . 1 so as to compensate for the attenuation brought about by the optical fiber on the section 9 . 1 and by the switch 14 . 1 .
  • This signal 21 is then sent to the optical switch 14 . 1 which deviates it to the optical switch 14 . 2 positioned downstream in relation to the switch 14 . 1 via an optical fiber section 9 . 2 .
  • This optical switch 14 . 2 which is in an inactive position (because it is no longer supplied with power because of a malfunction), does not deviate the light signal 21 to the screen 2 . 2 .
  • the signal 21 is then sent directly to the switch 14 . 3 via the optical fiber section 9 . 3 .
  • This switch 14 . 3 then sends this signal 21 to the screen 2 . 3 and re-sends an optical signal 22 amplified in relation to the signal 21 .
  • the signal 22 is then sent to the switch 14 .N via the section of fiber 9 .N.
  • This switch 14 .N also in an active position, sends the signal 22 to the screen 2 .N and re-amplifies it, and so on.
  • the information signal sent by the server 4 can thus be sent to all the screens 2 . 1 , 2 . 3 , 2 .N associated with an optical switch in good running condition, even if some switches of the network, such as the switch 14 . 2 , are not operating correctly.
  • each optical switch 14 . 1 - 14 .N comprises a fixed mirror 25 , as well as a first 26 and a second 27 mobile mirror, rotating, respectively, about an axis 26 . 1 and 27 . 1 perpendicular to the plane of the sheet.
  • the fixed mirror 25 is positioned between the mobile mirrors 26 , 27 .
  • the first mobile mirror 26 In the inactive position shown in FIG. 4 a (which is that of the switch 14 . 2 ), the first mobile mirror 26 has an angle a such that it reflects the light signal 21 sent from the fiber to the fixed mirror 25 .
  • This fixed mirror 25 reflects the signal sent from the mobile mirror to the second mobile mirror 27 .
  • This second mobile mirror 27 has an angle b such that it reflects the signal sent from the fixed mirror 25 to another switch.
  • the first mirror 26 has an angle a′ such that it reflects the light signal sent from the fiber to the screen, while the second mobile mirror 27 has an angle b′ such that it reflects the signal 21 sent from the screen to another switch.
  • each mobile mirror 26 , 27 comprises a first 31 and a second 32 control electrode, as shown FIG. 4 c .
  • the first electrode 31 is positioned on an end of the mobile mirror 26 , 27 and the second electrode 32 is positioned on a fixed part 33 of the switch.
  • the two electrodes 31 , 32 are spaced apart from each other by a mechanical force applied by a spring, for example, positioned in the rotating shaft, such that the mirrors 26 , 27 form an angle a and b, respectively, with the horizontal.
  • the switch is then in the inactive position (position in solid line).
  • the electrodes 31 , 32 When the electrodes 31 , 32 are supplied with power, they attract one another, such that the mirrors 26 , 27 turn and approach the support 33 . The mirrors 26 , 27 then form the angles a′ and b′, respectively, with the horizontal. This switch is then in the active position (position in dotted line).
  • the mirrors 26 , 27 pass from an inactive position to an active position by means of a repulsive force.
  • the rotation of the mirrors 26 , 27 is controlled by means of motors.
  • supplying the electrodes with power generates a twisting of the mirrors 26 , 27 mounted on a flexible material.
  • FIG. 5 shows a variant of the present invention in which each seat 3 . 1 - 3 .N comprises a plurality of seats and therefore a plurality of screens 2 . 1 - 2 .N.
  • the onboard network does not serve only one seat, but a row of two, three or four seats as shown.
  • an Ethernet type network switch 33 . 1 - 33 .N, or switch is added at each node, so as to direct the signals sent from the network to all the screens 2 . 1 - 2 .N of a same row of seats.
  • each switch 33 . 1 - 33 .N is connected, on the one hand, to the transceivers 15 . 1 and 16 . 1 of a box and, on the other hand, to the screens 2 . 1 - 2 .N of a row of seats.
  • the number of optical fibers is multiplied such that it is possible to connect two sets of seats 37 . 1 and 37 . 2 (or more) to the server 4 via distinct optical fibers 9 and 35 .
  • the seats of the set 37 . 2 (not shown) are connected to each other and to the server 4 in the same manner as the seats 3 . 1 - 3 .N of the set 37 . 1 already described.
  • FIG. 6 show an optical switch 14 . 1 connected to its power supply 38 via a circuit breaker 39 , such as a transistor operating under the standard conditions of all or nothing or any other equivalent switching device.
  • a circuit breaker 39 such as a transistor operating under the standard conditions of all or nothing or any other equivalent switching device.
  • the optical switch 14 . 1 When the circuit breaker 39 is closed, as shown in FIG. 6 a , the optical switch 14 . 1 is supplied with power such that it is active and ensures the sending of data to the network switch 33 . 1 with which it is associated, while, when the circuit breaker 39 is open as shown in FIG. 6 b , the optical switch 14 . 1 is not supplied with power such that it is inactive and sends the signals received from the network directly to the next optical switch 14 . 2 , without sending them to the network switch 33 . 1 with which it is associated in order to isolate the screens 2 . 1 that are connected to it.
  • a monitoring module 40 . 1 controlling the opening and the closing of the circuit breaker 39 is associated with each network switch 33 . 1 - 33 .N, this monitoring module 40 . 1 having the function of monitoring the coherence of data passing over the network.
  • This monitoring module 40 . 1 may, for example, take the form of a microcontroller.
  • the monitoring module 40 . 1 controls the opening of the circuit breaker 39 so as the put the switch 14 in the inactive position.
  • the said control module 40 . 1 controls the closing of the circuit breaker 39 so as to put the switch 14 in the active position.
  • the parameters monitored by the monitoring module 40 . 1 may, for example, be the number of acknowledgment signals sent by each of the screens 2 . 1 - 2 .N (this parameter makes it possible to measure the congestion of the network), or the number of frames sent by each of the screens 2 . 1 - 2 .N which are substituted with high-priority frames.
  • the thresholds associated with these different parameters may be different and are parameterizable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Selective Calling Equipment (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
US12/521,832 2007-01-05 2008-01-07 Switched optical fibre network for airplane seats Active 2029-11-02 US8380063B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0752542A FR2911229B1 (fr) 2007-01-05 2007-01-05 Reseau a fibre optique commutee pour sieges d'avion
FR0752542 2007-01-05
PCT/FR2008/050018 WO2008099098A2 (fr) 2007-01-05 2008-01-07 Réseau à fibre optique commutée pour sièges d'avion

Publications (2)

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US20100098418A1 US20100098418A1 (en) 2010-04-22
US8380063B2 true US8380063B2 (en) 2013-02-19

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US12/521,832 Active 2029-11-02 US8380063B2 (en) 2007-01-05 2008-01-07 Switched optical fibre network for airplane seats

Country Status (7)

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US (1) US8380063B2 (fr)
EP (1) EP2106638A2 (fr)
JP (1) JP5331706B2 (fr)
CN (1) CN101611576A (fr)
BR (1) BRPI0806306A2 (fr)
FR (1) FR2911229B1 (fr)
WO (1) WO2008099098A2 (fr)

Cited By (1)

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WO2016034457A1 (fr) * 2014-09-03 2016-03-10 British Telecommunications Public Limited Company Identification de défaillance de réseau optique

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
WO2008033870A2 (fr) 2006-09-11 2008-03-20 Lumexis Corporation Système de distribution par fibres de type fibre jusqu'au siège
ES2715850T3 (es) 2009-08-06 2019-06-06 Global Eagle Entertainment Inc Sistema de entretenimiento en vuelo de interconexión en red en serie de fibra hasta el asiento
WO2011020071A1 (fr) 2009-08-14 2011-02-17 Lumexis Corp. Dispositif de connexion d'unité d'affichage vidéo pour un système fibre à l'écran de divertissement à bord
US8416698B2 (en) 2009-08-20 2013-04-09 Lumexis Corporation Serial networking fiber optic inflight entertainment system network configuration
JP5838639B2 (ja) * 2011-08-02 2016-01-06 富士通株式会社 光伝送装置及び光伝送方法
EP2582152B1 (fr) * 2011-10-12 2018-08-29 ADVA Optical Networking SE Noeud distant, architecture de réseau et procédé de transmission de données pour réseau à fibre optique, en particulier pour la transmission de données à faible débit

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US4948218A (en) * 1988-07-14 1990-08-14 Mitsubishi Denki Kabushiki Kaisha Optoelectronic device for an optical communication system
US5274673A (en) * 1990-06-22 1993-12-28 Japan Aviation Electronics Industry Limited Optical bus transmission method and transmitting-side encoder and receiving-side decoder therefor
GB2347806A (en) 1999-03-12 2000-09-13 Bookham Technology Ltd A single wavelength bi-directional optical transceiver
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US4948218A (en) * 1988-07-14 1990-08-14 Mitsubishi Denki Kabushiki Kaisha Optoelectronic device for an optical communication system
US5274673A (en) * 1990-06-22 1993-12-28 Japan Aviation Electronics Industry Limited Optical bus transmission method and transmitting-side encoder and receiving-side decoder therefor
US20010021289A1 (en) * 1998-05-19 2001-09-13 Lynx Photonic Networks Inc Integrated optical switch array
GB2347806A (en) 1999-03-12 2000-09-13 Bookham Technology Ltd A single wavelength bi-directional optical transceiver
US20040235469A1 (en) * 2003-05-21 2004-11-25 Krug William P. High bandwidth open wired network
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016034457A1 (fr) * 2014-09-03 2016-03-10 British Telecommunications Public Limited Company Identification de défaillance de réseau optique
US10693555B2 (en) 2014-09-03 2020-06-23 British Telecommunications Public Limited Company Optical network faulted identification

Also Published As

Publication number Publication date
FR2911229A1 (fr) 2008-07-11
WO2008099098A3 (fr) 2009-01-08
WO2008099098A2 (fr) 2008-08-21
JP2010515391A (ja) 2010-05-06
FR2911229B1 (fr) 2009-04-03
US20100098418A1 (en) 2010-04-22
WO2008099098A4 (fr) 2009-02-19
CN101611576A (zh) 2009-12-23
BRPI0806306A2 (pt) 2011-09-06
JP5331706B2 (ja) 2013-10-30
EP2106638A2 (fr) 2009-10-07

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